Eddy Current Brake for Compact Strength Training Device
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Solution Overview
Problem
Existing strength training devices are cumbersome, technically complex, and not suitable for mobile use due to their size and weight, with inefficient eddy current brakes and complex mechanical designs that hinder portability and compactness.
Innovation Solution
A compact strength training device utilizing rotating metal/brake discs within a magnetic field for eddy current braking, eliminating the need for complex mechanical aids and allowing for variable resistance adjustment, which is cost-effective and wear-free.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical resistance mechanisms are used, then resistance can be applied to the continuous traction means, but the device becomes technically complex and cumbersome
Solution Approach 1:
The patent replaces complex mechanical resistance mechanisms with a magnetic field-based eddy current braking system. A magnet is positioned near a rotating metal disc that is part of the guide structure. As the disc rotates with the guide, eddy currents are induced in the disc, creating a magnetic brake that provides resistance to the continuous traction means without requiring complex mechanical components.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the rotating guide and the resistance generation mechanism. The magnetic field interacts with the conductive material in the guide to produce eddy currents, which in turn generate the resistive force. This intermediary approach eliminates the need for direct mechanical contact and complex resistance application mechanisms.
2Reliability
If multiple deflection rollers and mechanical resistance means are provided, then resistance can be set on the continuous traction means, but the device size increases and portability is reduced
Solution Approach 1:
The patent merges the guide structure with the resistance generation mechanism. The guide itself, which must rotate to function, is made conductive and positioned within a magnetic field. This integration means the guide performs dual functions: guiding the continuous traction means and generating resistance through eddy currents, eliminating the need for separate deflection rollers and resistance mechanisms.
Solution Approach 2:
The patent replaces multiple mechanical deflection rollers and resistance means with a compact magnetic field-based eddy current braking system. The magnetic brake provides variable resistance through electromagnetic interaction rather than mechanical contact, significantly reducing the space required for resistance generation components.
3Ease of operation
If the device is designed for portability, then it can be transported easily, but the means for generating resistance becomes technically complicated
Solution Approach 1:
The patent replaces bulky mechanical resistance generation mechanisms with a compact magnetic field-based eddy current braking system. The magnetic field interacts with conductive material in the guide to produce resistance without requiring complex mechanical components, making the device more suitable for portable applications.
Solution Approach 2:
The patent makes the guide structure multi-functional by rendering it conductive and positioning it within a magnetic field. The guide simultaneously performs its primary function of guiding the continuous traction means and generates resistance through eddy currents, eliminating the need for separate resistance generation components and reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device is highly efficient, compact, and portable, enabling easy transportation and use in various settings, with reduced wear and tear, and can be easily mounted on different structures, making it suitable for mobile strength training.
Implementation Method 1
eddy current losses of at least one metal disc rotating in a magnetic field generated by at least one magnet are used for braking or for generating the resistance
Implementation Method 2
the magnetic field of the magnetic cylinder rotating the movable discs perpendicularly interspersed
Data Source
Figure 1
Figure 2a~2b
Figure 3~4
AI summary
An exercise device uses a guide member that is rotatably arranged on a shaft. A continuous, flexible pulling member wraps around the guide member and causes the guide member to rotate when the continuous, flexible pulling member is pulled. Two rotatable metal discs are arranged coaxially with the guide member on the shaft, one rotatable metal disc being arranged on each side of the guide member. A gear set is operatively connecting the guide member and the two rotatable metal discs. A magnetic cylinder is arranged substantially parallel to the shaft between the two rotatable metal discs such that a magnetic field passes through radially outer areas of the rotatable metal discs in a substantially axial orientation. The rotatable metal discs and the magnetic cylinder form an eddy current brake which counteracts a pulling motion on the continuous, flexible pulling member.